Another vista of platforms radiated away from the terminal.

Gripping Torry's hand, Tharol Sen dragged him firmly along the platform, then down a steep slant to the lowest levels. At intervals, radilumes provided glaring light, but shadows of raw fantasy lingered curiously near the walls. Tomblike oppression gathered around them. Panic grows quickly underground; weight of rock pressing overhead translates itself to the brain in terms of claustrophobia.

Metallic decking became raw stone floor, and an endless tunnel unwound before them. Torry lost all track of direction, even the primary up and down. They went through underground workings like city streets lined with open front factories. Gray, barren vistas of workrooms were relieved by the stark symmetries of sleek machines, shielded atomic converters, and patiently revolving turbines. Here was the marvelously efficient underground economy of the old Martian civilization, still functioning and serving the remnants of a great race of builders and scientists.

On soaring cantilevered balconies and in alcoves, Torry glimpsed cliff like structures of offices and dwellings. Giant compressors labored to force a mighty pulse of breakable air—but the atmosphere was warm, dry and stifling. Runnels of sweat ran down Torry's body and vanished in quick evaporation; fever and exertion alternated in him; he blew hot and cold as energy burned away too quickly, and as drying sweat produced intense, quick chills. Temperatures dropped. Air seemed denser and was poisonously clouded with dust, but it was cool. Slowly it became chill and depressing with a hint of dampness in it. They came into a maze of galleries and pits, tunnels and vaults, less used and uninhabited portions of the deep-workings.

It was like a world apart, a place of dim storage bins with natural refrigeration, of packing sheds piled high with mountains of commercial molds, bales of dry, compressed and packed mushrooms. It smelled stale and foul, the air hideous with a powdery mist of mold dust and spores, and the incredible mustiness of mushroom spoilage. These caverns were empty of life, as if the troglodyte Martians had long ago joined their mummied dead.

Weakness suddenly caught up with Torry. Dizzy, he caught in panic at Tharol Sen for support. Grudgingly, after a moment's hesitation, she granted the help.

"I'm sorry," Torry apologized. "It's been a rather active three days. I guess Ferax and his boys hurt me more than I had thought."

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